<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>天气炎热案例1</title>
    <script src="js/vue.js"></script>
</head>

<body>
    <div id="root">
        <h2>今天天气很{{text}}</h2>
        <button v-on:click="fun">切换</button>
    </div>
</body>
<script>
    new Vue({
        el: "#root",
        data: {
            isHot: true
        },
        methods: {
            fun() {
                this.isHot = !this.isHot
            }
        },
        computed: {
            text() {
                return this.isHot ? "炎热" : "凉爽"
            }
        }
    })
</script>

</html>